On Tue, Aug 25, 2009 at 19:19:56, Kevin Hilman wrote: > Nori, Sekhar <nsek...@ti.com> writes: > > > Update the clock framework for dynamic CPU frequency change. > > > > clk_round_rate, clk_set_rate have been updated to handle dynamic frequency > > changes. > > > > davinci_set_pllrate() changes the PLL rate of a given PLL. This function > > has been presented as a generic function though it has been tested only > > on OMAP-L138 EVM. No other currently available DaVinci device will probably > > use this function, but any future device specific changes will hopefully be > > small enough to get taken care using a cpu_is_xxx() macro. > > > > The clk_set_parent() API is implemented to reparent clocks to > > asynchronous domains where possible and insulate them from frequency > > changes. > > > > An inline function is introduced to get to the parent PLL of a given > > clock. This is useful in finding out all the clocks which gets > > affected by a PLL rate change. > > > > Finally, another function is implemented to recalculate the PLL derived > > rates after the PLL rate has been changed. > > > > Tested on OMAP-L138 EVM. > > > > Signed-off-by: Sekhar Nori <nsek...@ti.com> > > Looks pretty good, minor comment below. And would also be nice to at > least boot test on one of the DM* boards.
Right, honestly haven't done that so far :) > > > --- > > arch/arm/mach-davinci/clock.c | 140 > > ++++++++++++++++++++++++++++++++++++++++- > > arch/arm/mach-davinci/clock.h | 18 +++++ > > 2 files changed, 155 insertions(+), 3 deletions(-) > > > > diff --git a/arch/arm/mach-davinci/clock.c b/arch/arm/mach-davinci/clock.c > > index 83d54d5..5cbb95e 100644 > > --- a/arch/arm/mach-davinci/clock.c > > +++ b/arch/arm/mach-davinci/clock.c > > @@ -19,6 +19,7 @@ > > #include <linux/mutex.h> > > #include <linux/platform_device.h> > > #include <linux/io.h> > > +#include <linux/delay.h> > > > > #include <mach/hardware.h> > > > > @@ -99,20 +100,50 @@ long clk_round_rate(struct clk *clk, unsigned long > > rate) > > if (clk == NULL || IS_ERR(clk)) > > return -EINVAL; > > > > + if (clk->round_rate) > > + return clk->round_rate(clk, rate); > > + > > return clk->rate; > > } > > EXPORT_SYMBOL(clk_round_rate); > > > > int clk_set_rate(struct clk *clk, unsigned long rate) > > { > > + unsigned long flags; > > + int ret = -EINVAL; > > + > > if (clk == NULL || IS_ERR(clk)) > > - return -EINVAL; > > + return ret; > > should probably also check for a non-NULL clk->set_rate here since > it's only defined for da850 currently. There is a check further down in this function, you ask to pull it further up? - /* changing the clk rate is not supported */ - return -EINVAL; + spin_lock_irqsave(&clockfw_lock, flags); + if (clk->set_rate) + ret = clk->set_rate(clk, rate); + spin_unlock_irqrestore(&clockfw_lock, flags); Thanks, Sekhar _______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source